Patent application number | Description | Published |
20130109516 | HYDRAULIC CONTROL SYSTEM FOR A WRAPPING TRANSMISSION | 05-02-2013 |
20130145757 | HYDRAULIC CONTROL SYSTEM - A hydraulic control system comprises: a regulator valve, which regulates a fluid pressure established by an oil pump to an operating pressure required in a control circuit; a signal pressure establishing valve, which applies a signal pressure to the regulator valve to determine a level of the fluid pressure to be established by the regulator valve; and an accumulator, which accumulates the operating pressure to be applied to the control circuit. The hydraulic control system is characterized by: an accumulator control valve, which is arranged between the accumulator and the control circuit, and which is adapted to connect the accumulator with the control circuit when opened, and to disconnect the accumulator from the control circuit when closed; and a signal pressure feeding passage, which delivers the signal pressure established by the signal pressure establishing valve to a signal pressure port of the accumulator control valve thereby actuating the accumulator control valve in accordance with the signal pressure. | 06-13-2013 |
20130289840 | HYDRAULIC CONTROL SYSTEM FOR AUTOMATIC TRANSMISSION - A hydraulic control system for an automatic transmission can improve a response and a controllability of the automatic transmission without increasing actuation frequency of the automatic transmission. The hydraulic control system is applied to an automatic transmission adapted to vary a torque capacity of a transmission member by an actuator. The hydraulic control system includes: a discharging device that discharges compressible gas entrained in the hydraulic fluid in the actuator; an interrupting device that interrupts power transmission; an entrainment determining device that determines an entrainment of the compressible gas in the hydraulic fluid; a disconnecting device that disconnects the power transmission by the interrupting device in case an entrained compressible gas is determined; and a discharging device that removes the entrained compressible gas from the hydraulic fluid by rotating the actuator while interrupting the power transmission. | 10-31-2013 |
20130305701 | HYDRAULIC CIRCUIT AND CONTROL SYSTEM THEREFOR - A hydraulic circuit and a hydraulic control system for preventing fluid leakage and power loss resulting from jamming of contaminants. A first circuit section has an accumulator for storing hydraulic pressure, and a control valve for controlling a passage for delivering fluid from the accumulator to an actuator. Fluid discharged from an oil pump is delivered continuously to a second circuit section. A first filter is disposed on a passage for delivering the fluid from the oil pump to the accumulator for the purpose of removing contaminants finer than those in the fluid to be delivered to the second circuit section from the fluid to be delivered to the accumulator. | 11-21-2013 |
20140035237 | SEALING STRUCTURE - A sealing structure capable of reducing oil leakage while preventing the oil from being deteriorated by a temperature rise of the oil. | 02-06-2014 |
20140182722 | SWITCH VALVE - A switch valve which is configured such that a plurality of land sections and a valley section between the land sections are formed in a valve element that advances or retreats in an axial direction according to a manual operation, a plurality of port sections opened are provided in a cylinder section in which the valve element is inserted so as to be capable of advancing and retreating, and the prescribed port sections are made to communicate with each other via the valley section according to a position of the valve element in the axial direction or be blocked by the land section, the switch valve includes a seal section that seals a space between portions on both sides in the axial direction across either one of the land sections in a liquid-tight manner. | 07-03-2014 |
20140329628 | HYDRAULIC CONTROL SYSTEM FOR AUTOMATIC TRANSMISSION - A hydraulic control system for an automatic transmission, in which a belt is applied to at least one pair of pulleys, and in which widths of belt grooves of the pulleys, or pressures to clamp the belt by the pulleys are controlled by hydraulic pressures applied to hydraulic chambers of the pulleys. The hydraulic control system is comprised of: a control valve that controls a delivery and a drainage of hydraulic fluid to/from the hydraulic chamber; and a drive frequency setting means that determines a drive frequency of a drive signal for actuating the control valves in such a manner that a phase of a local maximum value of amplitude of the drive signal is shifted from a phase of a local maximum value of amplitude of vibrations resulting from rotating the pulleys. | 11-06-2014 |
20150144207 | HYDRAULIC CONTROL UNIT - A hydraulic control unit is provided. A valve is comprised of a piston having a valve element, a cylinder holding the piston while allowing to reciprocate axially, a positive pressure chamber formed on one side of the piston to which pressure to open the valve is applied, a back pressure chamber formed on the other side of the piston to which the pressure to close the valve is applied, and a connection passage for differentiating pressures in the positive pressure chamber and the back pressure chamber. A pilot valve selectively connects the back pressure chamber with a site where the pressure is lower than that of the back pressure chamber. Hydraulic pressure lower than that applied to positive pressure chamber is applied to a low pressure section. The hydraulic control unit comprises a means to deliver the fluid from the low pressure section to the back pressure chamber if an opening motion of the valve is slower than a predetermined reference value, by opening the pilot valve to connect the back pressure chamber with the low pressure section. | 05-28-2015 |